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John the Ripper is a fast password cracker. Its primary purpose is to detect weak passwords. Besides several crypt(3) password hash types most commonly found on various Unix flavors, supported out of the box are Kerberos AFS and Windows NT/2000/XP/2003 LM hashes, plus several more with contributed patches.

For more information, consult the project's homepage and/or the documentation installed in /usr/doc/john-1.8.0